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The California Legacy Survey V. Chromospheric Activity Cycles in Main Sequence Stars
Howard Isaacson, Andrew W. Howard, Benjamin Fulton +31
We present optical spectroscopy of 710 solar neighborhood stars collected over twenty years to catalog chromospheric activity and search for stellar activity cycles. The California…
The California-Kepler Survey. XI. A Survey of Chromospheric Activity Through the Lens of Precise Stellar Properties
Howard Isaacson, Stephen R. Kane, Brad Carter +4
Surveys of exoplanet host stars are valuable tools for assessing population level trends in exoplanets, and their outputs can include stellar ages, activity, and rotation periods.…
A hidden population of massive white dwarfs: two spotted K+WD binaries
D. M. Rowan, T. Jayasinghe, M. A. Tucker +10
The identification and characterization of massive () white dwarfs is challenging in part due to their low luminosity. Here we present two candidate single-lin…
First Observations of the Brown Dwarf HD 19467 B with JWST
Alexandra Z. Greenbaum, Jorge Llop-Sayson, Ben Lew +21
We observed HD 19467 B with JWST's NIRCam in six filters spanning 2.5-4.6 with the Long Wavelength Bar coronagraph. The brown dwarf HD 19467 B was initially identified through…
The full phase curve of the eclipsing hot white dwarf binary system KOI-964
Ian Wong, Avi Shporer, Juliette C. Becker +6
We analyze the full phase curve of KOI-964, a binary system consisting of a hot white dwarf on an eclipsing orbit around an A-type host star. Using all 18 quarter…
Six new rapidly oscillating Ap stars in the Kepler long-cadence data using super-Nyquist asteroseismology
Daniel R. Hey, Daniel L. Holdsworth, Timothy R. Bedding +6
We perform a search for rapidly oscillating Ap stars in the Kepler long-cadence data, where true oscillations above the Nyquist limit of 283.21 μHz can be reliably distinguished fr…
Discovery of a White Dwarf Companion to HD 159062
Lea A. Hirsch, David R. Ciardi, Andrew W. Howard +11
We report on the discovery of a white dwarf companion to the nearby late G dwarf star, HD 159062. The companion is detected in 14 years of precise radial velocity (RV) data, and in…
The Mass of the White Dwarf Companion in the Self-Lensing Binary KOI-3278: Einstein vs. Newton
Daniel A. Yahalomi, Yossi Shvartzvald, Eric Agol +10
KOI-3278 is a self-lensing stellar binary consisting of a white-dwarf secondary orbiting a Sun-like primary star. Kruse and Agol (2014) noticed small periodic brightenings every 88…
HAT-TR-318-007: a double-lined M-dwarf binary with total secondary eclipses discovered by HATNet and observed by K2
J. D. Hartman, S. N. Quinn, G. Á. Bakos +11
We report the discovery by the HATNet survey of HAT-TR-318-007, a d period detached double-lined M-dwarf binary with total secondary eclipses. We comb…
Three statistically validated K2 transiting warm Jupiter exoplanets confirmed as low-mass stars
Avi Shporer, George Zhou, Andrew Vanderburg +11
We have identified three K2 transiting star-planet systems, K2-51 (EPIC 202900527), K2-67 (EPIC 206155547), and K2-76 (EPIC 206432863), as stellar binaries with low-mass stellar se…
A Transient Transit Signature Associated with the Young Star RIK-210
Trevor J. David, Erik A. Petigura, Lynne A. Hillenbrand +14
We find transient, transit-like dimming events within the K2 time series photometry of the young star RIK-210 in the Upper Scorpius OB association. These dimming events are variabl…
Discovery and Follow-up Observations of the Young Type Ia Supernova 2016coj
WeiKang Zheng, Alexei V. Filippenko, Jon Mauerhan +39
The Type~Ia supernova (SN~Ia) 2016coj in NGC 4125 (redshift ) was discovered by the Lick Observatory Supernova Search 4.9 days after the fitted first-light time (FFLT;…
Kepler Eclipsing Binary Stars. VII. The Catalog of Eclipsing Binaries Found in the Entire Kepler Data-Set
Brian Kirk, Kyle Conroy, Andrej Prša +47
The primary Kepler Mission provided nearly continuous monitoring of ~200,000 objects with unprecedented photometric precision. We present the final catalog of eclipsing binary syst…
Time-Varying Potassium in High-Resolution Spectra of the Type Ia Supernova 2014J
M. L. Graham, S. Valenti, B. J. Fulton +9
We present a time series of the highest resolution spectra yet published for the nearby Type Ia supernova (SN) 2014J in M82. They were obtained at 11 epochs over 33 days around pea…
Finding compact hot subdwarf binaries in the Galactic disc
T. Kupfer, S. Geier, A. Faye McLeod +15
We started a new project which aims to find compact hot subdwarf binaries at low Galactic latitudes. Targets are selected from several photometric surveys and a spectroscopic follo…
Photometrically derived masses and radii of the planet and star in the TrES-2 system
Thomas Barclay, Daniel Huber, Jason F. Rowe +16
We measure the mass and radius of the star and planet in the TrES-2 system using 2.7 years of observations by the Kepler spacecraft. The light curve shows evidence for ellipsoidal…
Three New Eclipsing White-dwarf - M-dwarf Binaries Discovered in a Search for Transiting Planets Around M-dwarfs
Nicholas M. Law, Adam L. Kraus, Rachel Street +24
We present three new eclipsing white-dwarf / M-dwarf binary systems discovered during a search for transiting planets around M-dwarfs. Unlike most known eclipsing systems of this t…
PTF1 J071912.13+485834.0: An outbursting AM CVn system discovered by a synoptic survey
David Levitan, Benjamin J. Fulton, Paul J. Groot +14
We present extensive photometric and spectroscopic observations of PTF1 J071912.13+485834.0, an outbursting AM CVn system discovered by the Palomar Transient Factory (PTF). AM CVn…
A Search for Pulsations in Helium White Dwarfs
Justin D. R. Steinfadt, Lars Bildsten, David L. Kaplan +5
The recent plethora of sky surveys, especially the Sloan Digital Sky Survey, have discovered many low-mass (M < 0.45 Msun) white dwarfs that should have cores made of nearly pure h…
The LCOGT Network
A. Shporer, T. Brown, T. Lister +5
Motivated by the increasing need for observational resources for the study of time varying astronomy, the Las Cumbres Observatory Global Telescope (LCOGT) is a private foundation,…